Malicious PDF — malware analysis report

Static analysis result for SHA-256 995159b091c7cf13…

MALICIOUS

PDF

67.5 KB Created: 2021-09-24 19:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fd0e5e921140092a40566341622da18 SHA-1: 25660ae471f91708be3a7f313ec551cbe62e3b85 SHA-256: 995159b091c7cf138d9c787f447539e709097798e351845936a3f48e52c19e40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting a link farm for malicious redirection. The embedded JavaScript is likely responsible for initiating the malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=take+full+backup+of+android+phone+on+pc PDF link annotation
    • http://asijskepotraviny.cz/files/file/26431747183.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109161606442931.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/teximazugexorerupaz.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/suxewupiwuvituwo.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/81760975308.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vonapeminemu.pdfIn PDF document text
    • https://terracell.info/images/file/70179508443.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/rorejikogapudaloxebevefos.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vonabaketu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/8622272722.pdfIn PDF document text
    • http://netart.hu/userfiles/file/92648979289.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/23915898652.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/21489524070.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/97626876167.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51299290430.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/66996488746.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210903_075517.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/8611925849.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/85139399391.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/lufa7deijanrpdrjojv12e02s6/mowolalejolabubud.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/nodafewo.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/tonekerowixevukev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 14564 bytes
SHA-256: dd66b338783c1467ad67a5ac76b79965cd776952028ae9a3ad879672a32d51cc
font_02_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10748 bytes
SHA-256: a699c69fe0f9c0ce6a2fe12c2f9c49e435b31fc79608671157e763e30027998a

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